What we found being stable, being running and developed in different flavors since the '88 (hoooooly cow, feels like yesterday...) is IRC.
We dabbed with our own hosted server at irc.gamerstavern.online (port 6697) and I must say that, as simple as it could be, it is still a better system than Matrix.
In addition to that, to help our less-tech-savvy users, we also decided to host TheLounge, a neat client that help simplifying the usage of IRC and allows users to jump in chat with our community (both on IRC and Discord, being the two of them bridged with a self hosted tool), without the need of registering an user.
Feels too good to be true?
Jump in chat.gamerstavern.online and see for yourself ;)


